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A few days ago, Queen Elizabeth II unveiled a new plaque that contains a hidden message. Can you break this code?
In 1931, codebreaker and book author Herbert Yardley published an encrypted message without providing the plaintext. Can a reader decipher it?
Years ago, Otto Leiberich, the former president of the West German cipher authority, told me about a little known encryption system developed by his team. Can you break a challenge cryptogram I have created with this system?
Blog reader Magnus Ekhall has created a software that simulates an Enigma breaking device. He has also published a few challenges, one of which is still unsolved.
In the early 19th century, an unknown person sent an encrypted postcard from Munich to Berlin. It is not hard to decipher.
Louis XIV of France, also known as the Sun King, is one of the most important figures in European history. An encrypted letter he wrote in 1693 has never been deciphered.
According to a recent BBC article, a British student has broken a “religious code” from the 18th century. What is behind it?
In 1905 and 1906 a man named Harry sent a series of encrypted postcards to a friend named Charlie. Can a reader decipher these messages?
Yesterday I visited a great crypto exhibition hosted by the German Armed Forces in Feldafing near Munich. I saw many interesting cipher exhibits, as well as a photograph of an encryption machine I had never heard of before. Can a reader help to find out more about this device?
A French magazine article reports on an encrypted diary written by a pedophile priest. The plaintext is not known to me. Can a reader break it?
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